Coffee mug



FIG. 1 is an isometric view of a coffee mug showing my new design;

FIG. 2 is a right side elevational view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof; and

FIG. 6 is a front elevational view thereof.

The rear elevational view is a mirror image of the front elevational view. 

The ornamental design for a coffee mug, as shown and described. 